ARM: omap4: tuna: Enable BRCM 4330 bluetooth.

Contributions from: sj0822.lee <sj0822.lee@samsung.com>

Change-Id: Iaad054d988370661804f3d572e86912bc15c9199
Signed-off-by: Jaikumar Ganesh <jaikumar@google.com>

3 files changed, 315 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index e89711e..348c869 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -256,6 +256,7 @@ obj-$(CONFIG_MACH_TUNA)			+= board-tuna-nfc.o
 obj-$(CONFIG_MACH_TUNA)			+= board-tuna-power.o
 obj-$(CONFIG_MACH_TUNA)			+= board-tuna-sensors.o
 obj-$(CONFIG_MACH_TUNA)			+= board-tuna-wifi.o
+obj-$(CONFIG_MACH_TUNA)			+= board-tuna-bluetooth.o
 
 
 obj-$(CONFIG_MACH_OMAP3517EVM)		+= board-am3517evm.o \
diff --git a/arch/arm/mach-omap2/board-tuna-bluetooth.c b/arch/arm/mach-omap2/board-tuna-bluetooth.c
new file mode 100644
index 0000000..ec58454
--- /dev/null
+++ b/arch/arm/mach-omap2/board-tuna-bluetooth.c
@@ -0,0 +1,295 @@
+/*
+ * Bluetooth Broadcomm  and low power control via GPIO
+ *
+ *  Copyright (C) 2011 Google, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/hrtimer.h>
+#include <linux/irq.h>
+#include <linux/rfkill.h>
+#include <linux/platform_device.h>
+#include <linux/serial_core.h>
+#include <linux/wakelock.h>
+#include <asm/mach-types.h>
+
+#define BT_REG_GPIO 103
+#define BT_RESET_GPIO 42
+
+#define BT_WAKE_GPIO 27
+#define BT_HOST_WAKE_GPIO 177
+
+static struct rfkill *bt_rfkill;
+
+struct bcm_bt_lpm {
+	int wake;
+	int host_wake;
+	bool rx_wake_lock_taken;
+
+	struct hrtimer enter_lpm_timer;
+	ktime_t enter_lpm_delay;
+
+	struct uart_port *uport;
+
+	struct wake_lock wake_lock;
+	char wake_lock_name[100];
+} bt_lpm;
+
+static int bcm4330_bt_rfkill_set_power(void *data, bool blocked)
+{
+	// rfkill_ops callback. Turn transmitter on when blocked is false
+	if (!blocked) {
+		gpio_set_value(BT_REG_GPIO, 1);
+		gpio_set_value(BT_RESET_GPIO, 1);
+
+	} else {
+		gpio_set_value(BT_RESET_GPIO, 0);
+		gpio_set_value(BT_REG_GPIO, 0);
+	}
+
+	return 0;
+}
+
+static const struct rfkill_ops bcm4330_bt_rfkill_ops = {
+	.set_block = bcm4330_bt_rfkill_set_power,
+};
+
+static void set_wake_locked(int wake)
+{
+	bt_lpm.wake = wake;
+
+	if (!wake)
+		wake_unlock(&bt_lpm.wake_lock);
+
+	gpio_set_value(BT_WAKE_GPIO, wake);
+}
+
+static enum hrtimer_restart enter_lpm(struct hrtimer *timer) {
+	unsigned long flags;
+	spin_lock_irqsave(&bt_lpm.uport->lock, flags);
+	set_wake_locked(0);
+	spin_unlock_irqrestore(&bt_lpm.uport->lock, flags);
+
+	return HRTIMER_NORESTART;
+}
+
+void bcm_bt_lpm_exit_lpm_locked(struct uart_port *uport) {
+	bt_lpm.uport = uport;
+
+	hrtimer_try_to_cancel(&bt_lpm.enter_lpm_timer);
+
+	set_wake_locked(1);
+
+	hrtimer_start(&bt_lpm.enter_lpm_timer, bt_lpm.enter_lpm_delay,
+		HRTIMER_MODE_REL);
+}
+EXPORT_SYMBOL(bcm_bt_lpm_exit_lpm_locked);
+
+void bcm_bt_rx_done_locked(struct uart_port *uport) {
+	if (bt_lpm.host_wake) {
+		// Release wake in 500 ms so that higher layers can take it.
+		wake_lock_timeout(&bt_lpm.wake_lock, HZ/2);
+		bt_lpm.rx_wake_lock_taken = true;
+	}
+}
+EXPORT_SYMBOL(bcm_bt_rx_done_locked);
+
+static void update_host_wake_locked(int host_wake)
+{
+	if (host_wake == bt_lpm.host_wake)
+		return;
+
+	bt_lpm.host_wake = host_wake;
+
+	if (host_wake) {
+		bt_lpm.rx_wake_lock_taken = false;
+		wake_lock(&bt_lpm.wake_lock);
+	} else if (!bt_lpm.rx_wake_lock_taken) {
+		// Failsafe timeout of wakelock.
+		// If the host wake pin is asserted and no data is sent,
+		// when its deasserted we will enter this path
+		wake_lock_timeout(&bt_lpm.wake_lock, HZ/2);
+	}
+
+}
+
+static irqreturn_t host_wake_isr(int irq, void *dev)
+{
+	int host_wake;
+	unsigned long flags;
+
+	host_wake = gpio_get_value(BT_HOST_WAKE_GPIO);
+	irq_set_irq_type(irq, host_wake ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH);
+
+	if (!bt_lpm.uport) {
+		bt_lpm.host_wake = host_wake;
+		return IRQ_HANDLED;
+	}
+
+	spin_lock_irqsave(&bt_lpm.uport->lock, flags);
+	update_host_wake_locked(host_wake);
+	spin_unlock_irqrestore(&bt_lpm.uport->lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+static int bcm_bt_lpm_init(struct platform_device *pdev)
+{
+	int irq;
+	int ret;
+	int rc;
+
+	rc = gpio_request(BT_WAKE_GPIO, "bcm4330_wake_gpio");
+	if (unlikely(rc)) {
+		return rc;
+	}
+
+	rc = gpio_request(BT_HOST_WAKE_GPIO, "bcm4330_host_wake_gpio");
+	if (unlikely(rc)) {
+		gpio_free(BT_WAKE_GPIO);
+		return rc;
+	}
+
+	hrtimer_init(&bt_lpm.enter_lpm_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	bt_lpm.enter_lpm_delay = ktime_set(1, 0);  /* 1 sec */
+	bt_lpm.enter_lpm_timer.function = enter_lpm;
+
+	bt_lpm.host_wake = 0;
+
+	irq = gpio_to_irq(BT_HOST_WAKE_GPIO);
+	ret = request_irq(irq, host_wake_isr, IRQF_TRIGGER_HIGH,
+		"bt host_wake", NULL);
+	if (ret) {
+		gpio_free(BT_WAKE_GPIO);
+		gpio_free(BT_HOST_WAKE_GPIO);
+		return ret;
+	}
+
+	ret = irq_set_irq_wake(irq, 1);
+	if (ret) {
+		gpio_free(BT_WAKE_GPIO);
+		gpio_free(BT_HOST_WAKE_GPIO);
+		return ret;
+	}
+
+	gpio_direction_output(BT_WAKE_GPIO, 0);
+	gpio_direction_input(BT_HOST_WAKE_GPIO);
+
+	snprintf(bt_lpm.wake_lock_name, sizeof(bt_lpm.wake_lock_name),
+			"BTLowPower");
+	wake_lock_init(&bt_lpm.wake_lock, WAKE_LOCK_SUSPEND,
+			 bt_lpm.wake_lock_name);
+	return 0;
+}
+
+static int bcm4330_bluetooth_probe(struct platform_device *pdev)
+{
+	int rc = 0;
+	int ret = 0;
+
+	rc = gpio_request(BT_RESET_GPIO, "bcm4330_nreset_gpip");
+	if (unlikely(rc)) {
+		return rc;
+	}
+
+	rc = gpio_request(BT_REG_GPIO, "bcm4330_nshutdown_gpio");
+	if (unlikely(rc)) {
+		gpio_free(BT_RESET_GPIO);
+		return rc;
+	}
+
+	gpio_direction_output(BT_REG_GPIO, 1);
+	gpio_direction_output(BT_RESET_GPIO, 1);
+
+	bt_rfkill = rfkill_alloc("bcm4330 Bluetooth", &pdev->dev,
+				RFKILL_TYPE_BLUETOOTH, &bcm4330_bt_rfkill_ops,
+				NULL);
+
+	if (unlikely(!bt_rfkill)) {
+		gpio_free(BT_RESET_GPIO);
+		gpio_free(BT_REG_GPIO);
+		return -ENOMEM;
+	}
+
+	rc = rfkill_register(bt_rfkill);
+
+	if (unlikely(rc)) {
+		rfkill_destroy(bt_rfkill);
+		gpio_free(BT_RESET_GPIO);
+		gpio_free(BT_REG_GPIO);
+		return -1;
+	}
+
+	rfkill_set_states(bt_rfkill, true, false);
+	bcm4330_bt_rfkill_set_power(NULL, true);
+
+	ret = bcm_bt_lpm_init(pdev);
+	if (ret) {
+		rfkill_unregister(bt_rfkill);
+		rfkill_destroy(bt_rfkill);
+
+		gpio_free(BT_RESET_GPIO);
+		gpio_free(BT_REG_GPIO);
+	}
+
+	return ret;
+}
+
+static int bcm4330_bluetooth_remove(struct platform_device *pdev)
+{
+	rfkill_unregister(bt_rfkill);
+	rfkill_destroy(bt_rfkill);
+
+	gpio_free(BT_REG_GPIO);
+	gpio_free(BT_RESET_GPIO);
+	gpio_free(BT_WAKE_GPIO);
+	gpio_free(BT_HOST_WAKE_GPIO);
+
+	wake_lock_destroy(&bt_lpm.wake_lock);
+	return 0;
+}
+
+static struct platform_driver bcm4330_bluetooth_platform_driver = {
+	.probe = bcm4330_bluetooth_probe,
+	.remove = bcm4330_bluetooth_remove,
+	.driver = {
+		   .name = "bcm4330_bluetooth",
+		   .owner = THIS_MODULE,
+		   },
+};
+
+static int __init bcm4330_bluetooth_init(void)
+{
+	return platform_driver_register(&bcm4330_bluetooth_platform_driver);
+}
+
+static void __exit bcm4330_bluetooth_exit(void)
+{
+	platform_driver_unregister(&bcm4330_bluetooth_platform_driver);
+}
+
+
+module_init(bcm4330_bluetooth_init);
+module_exit(bcm4330_bluetooth_exit);
+
+MODULE_ALIAS("platform:bcm4330");
+MODULE_DESCRIPTION("bcm4330_bluetooth");
+MODULE_AUTHOR("Jaikumar Ganesh <jaikumar@google.com>");
+MODULE_LICENSE("GPL");
diff --git a/arch/arm/mach-omap2/board-tuna.c b/arch/arm/mach-omap2/board-tuna.c
index 8b3eed9..8239ef4 100755
--- a/arch/arm/mach-omap2/board-tuna.c
+++ b/arch/arm/mach-omap2/board-tuna.c
@@ -137,9 +137,27 @@ static struct platform_device ramconsole_device = {
 	.resource       = ramconsole_resources,
 };
 
+static struct platform_device bcm4330_bluetooth_device = {
+	.name = "bcm4330_bluetooth",
+	.id = -1,
+};
+
+static void __init tuna_bt_init(void)
+{
+	/* BT_EN - GPIO 104 */
+	omap_mux_init_signal("gpmc_ncs6.gpio_103", OMAP_PIN_OUTPUT);
+	/*BT_nRST - GPIO 42 */
+	omap_mux_init_signal("gpmc_a18.gpio_42", OMAP_PIN_OUTPUT);
+	/* BT_WAKE - GPIO 27 */
+	omap_mux_init_signal("dpm_emu16.gpio_27", OMAP_PIN_OUTPUT);
+	/* BT_HOST_WAKE  - GPIO 177 */
+	omap_mux_init_signal("kpd_row5.gpio_177", OMAP_PIN_INPUT);
+}
+
 static struct platform_device *tuna_devices[] __initdata = {
 	&ramconsole_device,
 	&wl1271_device,
+	&bcm4330_bluetooth_device,
 };
 
 static void __init tuna_init_early(void)
@@ -571,6 +589,7 @@ static void __init tuna_init(void)
 	tuna_wlan_init();
 	tuna_audio_init();
 	tuna_i2c_init();
+	tuna_bt_init();
 	platform_add_devices(tuna_devices, ARRAY_SIZE(tuna_devices));
 	board_serial_init();
 	omap2_hsmmc_init(mmc);